Kongo landed some shots on shit chin Mir and you didn't see him getting dropped every 10 seconds.
Cain's chin really isn't that great he just hasn't been hit very hard except a few times when he showed it such as getting dogged by Kongo to the point he got double legged. And JDS(who I don't even like) landed that shot on him.
Cain has only been in 13 fights you guys and 5 were with the same 2 people wait til he has 25-30 fights like the other greats of MMA and we'll discuss his chin then. By then he will have lost several times.
No he did not land on mir but maybe 2 punches that did not land flush